Steam boiler



\ \H1 1 l 1 1 l STEAM BOILER Filed July 1950 ll/IIIIIIIA'IIIIIIII I I I I III/II II II I III III ATTO E Patented Feb. 19, 1935 UNITED STATES 1,991,428 STEAM BOILER Thomas B. Stillman, South Orange, N. J assignor to The Babcock & Wilcox Company, Bayonne, N. J., a corporation of New Jersey Application July 2, 1930, Serial No. 465,291 7 7 Claims. (Cl. t22-325) This invention relates to boilers and more particularly to steam boilers of the marine type, although it will be apparent that various features of the invention are equally well adapted to 5 other types and to the generation of vapors other than steam.

An-object of this invention is to provide an improved construction of boiler having a compact arrangement of parts which will be eflicient in operation and relatively cheap to manufacture and install.

This and other objects which will be apparentto those skilled in this particular art are attained by means of the invention illustrated in the accompanying drawing in which Fig. 1 is a halfsectional, half-elevational view of a twin unit boiler constructed in accordance with one embodiment of this invention and Fig. 2 is a horizontal sectional view of one end of the drum 17.

:0 As illustrated the present invention includes a single boiler furnace 5 having a combustion chamber 6 provided with fuel burning mech anism such as oil burners 'l. A twin-unit boiler having two boiler units of similar construction is ;5 located above the combustionchamber 6. Each unit includes a steam and water drum 8 connected by nipples 9 with cylindrical uptake headers 10 connected to cylindrical downtake headers 11 by banks of tubes 12 which are curved 0 in the manner shown so as to position the associated headers at an inclination to .each other along the sides of a tapered gas pass, as more fully described in my co-pending application, Serial #199,167, filed June 16, 1927. The upper 5 ends of the downtake headers 11 are connected to the water space of the steam and water drum 8 by nipples 13, curved inwardly to permit the drum 8 to be located inwardly of the plane of the downtake headers 11 so as to provide the most com- 0 pact arrangement possible; I.

'The lower ends of the downtake headers 11 are connected by nipples 14 to a water drum 15 connected by a bank of curved tubes 16, curved on the same are as the banks of tubes 12, with a wa- 5 ter drum 17 which is common to each unit of the boiler and which is connected by nipples 18 with the lower ends'of the headers 10 of each boiler unit. A partition 19 is provided in the drum 17 to prevent surging of the water in relatively large 0 quantities from one boiler unit to the other, in the case of a ship rolling at seaor developing a permanent list. This partition is of sectional construction and consists of upper and lower sections connected together by bolts 20 or other suit- 5 able fastening means. The partition is secured ing said last-named drum with each of said 'fi rstin place within the drum by bolts 21 or similar fastening means connecting the upper edge of the partition to a depending flange 22 formed along the inside of the drum.

Each boiler unit has superheater tubes 23 lo- 5 cated between the banks of tubes 12 and 16. The steam space of each drum is connected by a pipe 24 with a steam distributor 25 which is in turn connected by pipes 26 with each of the superheaters 23. This distributor 25 provides an arrangement in which the steam and water drums of the two units are always cross-connected so that there is no possibility of difierent pressures existing on the two sides of the common water drum 17. If desired the steam leaving the two 15 superheaters can be combined by means of a fitting somewhat similar to the distributor 25 which will be connected directly to the main steam line.

The operation of the boiler is believed to be apparent. The common water drum 17 forms a part of the circulation system of each unit and permits each unit to be combined in a very compact arrangement. By means of the fitting or distributor 25 the superheater connections are employed to maintain substantially the same pressure in each unit of the boiler on each side of the common water drum. The partition 19 placed within the drum prevents surging of water from one unit to another and being sectional in form can be easily removed when it is necessary for a man to enter the drum for any purpose.

Although I have described a specific arrangement in more or less detail'jit will be apparent that various additions, omissions and substitutions can be made therein without departing from the spirit of this invention or the scope of the-appended claims.

What I claim as new, and desire to secure by Letters Patent, is: 40

1. A- double unit boiler, each unit including uptake and downtake cylindrical headers, a bank of curved steam generating tubes connected to said headers, a separate steam and water drum connected to the headers of each unit, a cross drum connected to the lower ends of'the downtake headers of each unit, a cross drum connected to the lower ends of the uptake headers of each unit and a separate bank of curved tubes conne'ttnamed crossdrums, a superheater located between said banks of tubes in each unit, a saturated steam distributor connected to each of said steam and water drums and connections between said distributor and each of said superheaters.-

2. A double unit boiler, each unit including uptake and downtake headers, a bank of steam generating tubes connected to said headers, .a separate steam and water drum connected to the headers of each unit, a cross drum connected to to the lower ends of the downtake headers of each unit, a cross drum connected to the lower ends l of the uptake headers of each unit and a separate bank of tubes connecting said last-named drum with each of said first named cross drums, a superheater located between said banks of tubes in each unit, a saturated steam distributor connected to each of said-steam and water drums and connections between said distributor and each of said superheaters. 3. A double unit boiler, each unit including uptake and downtake headers, a bank of curved steam generating tubes connected to said headers, a separate steam and water drum connected to the headers of each unit, a cross drum connected to the lower ends of the downtake headers of each unit, a cross drum connected to the lower ends of the uptake headers of each unit and a separate bank or curved tubes connecting said last-named drum with each of said first-named cross drums, a superheater located between said banks of tubes in each unit, a saturated steam distributor connected to each of said steam and water drums and connections between said distributor and each of said superheaters.

4. A double 'unit* boiler each unit including uptake and downtake cylindricalheaders, a bank of steam generating tubes connected to said headers, a separate steam and water drum connected to the headers 01 each unit, a cross drum connected to the lower ends of the downtake headers 01! each unit, a cross drum connected to the lower ends of the uptake headers of each unit and a separate bank oi! tubes connecting said lastnamed drum with each of said first-named cross drums, a superheater located between said banks of tubes in each unit, a saturated steam distributor connected to each of said steam and water drums and connections between said distributor and each or said superheaters.

5. In a twin unit boilerof the marine type upwardly converging banks of steam generating tubes, an upper drum connected to both banks of tubes, a sectional surge plate construction dividing the drum into substantially equal compartments and preventing the surging of water from one compartment to the other under movements such as those caused by the rolling of a ship at'sea, said surge plate construction having a transverse wall spaced from the end of the drum to provide an access space extending entirely across the drum at its end.

6. A twin unit marine boiler comprising, in-

combination, separateboiler units, each unit including a separate bank of steam generating tubes, and a separate steam and water drum connected to each bank of tubes, a submerged water drum connected to both of said boiler units *so as to form a part of the path of circulation in each unit, and a partition comprising readily removable sections and entirely extending across the interior of said water drum to prevent the surging of water from one unit to the other, said partition constituting a surge plate separating the drum space into two substantialy equal parts;

7. In a twin unit water tube marine boiler, opposed boiler units each having upwardly converging uptake and downtake headers arranged at the opposite sides of separate and tapered gas passes for the units, separate steam and water drums for the units, a bank of curved steam generating tubes connecting the uptake and downtake headers of each unit, a cross drum connected to the lower ends of the downtake headers of each unit, a centrally arranged and submerged cross drum common to both units and connected to the lower ends of the uptake headers 01 each unit, additional banks of curved steam generating tubes connecting the common drum to each .of the'first cross drums and being inclined upwardly toward the common drum to deflne the upper portion of an A-shaped combustion chamher, a furnace beneath the boiler, and oil burners arranged along a wall 01' the furnace extending at right angles to the drums.

' THOMAS B. STILIMAN. 

